The ‘Foggy swamp’
It would not be new that Nopis get lost, the best example is the swamp where a huge amount of ‘Mud-tanks’ were lost.
'Mud tanks’ are giant tanks which were created for areas where normal tanks would get stuck. Their powerful engine lets them move, even if they are completely covered by the mud. However, this tank is a prototype and was not tested yet. A few years ago, King Nopi sent a ‘Mud-tank’ battalion to the swamps because of rumors that there were demons. On their way, the tank battalion began to sink till they vanished deep down in the swamp. Unfortunately the engine of their tanks was NOT strong enough to move them anymore, months passed and soon the Nopis started to connect their tanks with big pipes to form a settlement. Because King Nopi has never gotten a message of the battalion, it sent another one which will face the same fate.
This was the start of the first(?) growing swamp settlement of Nopis. Since the Nopis haven’t turned off their engines, the polluted air starts to gather in bubbles which float up to the surface.
This is the reason why this swamp area is called ‘Foggy swamp’.